Use lossy prefs in the net predictor, and update them more frequently

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 527a366eba090f0a43ab5d8c8d5f701205389f08..48ed9b2b80bd21379fa8a688e3aee63ceddcaa66 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -238,13 +238,11 @@ class Predictor {
   void DnsPrefetchMotivatedList(const std::vector<GURL>& urls,
                                 UrlInfo::ResolutionMotivation motivation);
 
-  // May be called from either the IO or UI thread and will PostTask
-  // to the IO thread if necessary.
+  // Called from the UI thread in response to the load event.
   void SaveStateForNextStartup();
 
   void SaveDnsPrefetchStateForNextStartup(base::ListValue* startup_list,
-                                          base::ListValue* referral_list,
-                                          base::WaitableEvent* completion);
+                                          base::ListValue* referral_list);
 
   // May be called from either the IO or UI thread and will PostTask
   // to the IO thread if necessary.